Cement for acid-proof brickwork



coxvwosnunvs,

Patented Dec. 4, 1934 UNITED STATES Examinl PATENT OFFICE CEMENT FOR ACID-PROOF BRICKWORK poration of Delaware No Drawing.

Application February 17, 1931,

$M No. 516,519. In Germany December 19,

2 Claims.

My invention relates to acid-proof cement which is prepared with water-glass. The object of the invention is such a cement which does not become brittle even under temperature fluctuations, but retains to a considerable extent the elasticity required for filling the joints in acidproot brickwork.

The cement according to the invention, besides comprising quartz s ang and quartz powder, includes also materials which have a flaky or fibrous structure, such as micro-asbestos (asbestos powder), talcum or the like.

For example, according to the invention, a cement of this kind may consist of the following components, it the particular object for'which it is intended, admits of a somewhat coarse grain:

1 part by volume uartz sand,

3 parts by volume uartz dust i. e. ground quartz which passes thTougH a No. 200 sieve (American) with a mesh opening of 0.0029 inches.

2 parts of volume of talcum and about 2 parts of volume of water lass.

If a fine-grain cement 1s' required, the quartz sand ingredients are reduced and the quartz dust increased. After the addition of the water glass, the solid bodies are carefully mixed and are then ready for further use in the usual manner.

I claim:

1. Cement for acid-proof brickwork, consisting of a mixture of quartz sand and quartz dust with talcum and water-glass solution.

2. Cement for acid-proof brickwork, consisting of a mixture'of one part by volume of quartz sand, 3 parts by volume of quartz dust 2 parts by volume of talcum and substantially 2 parts by volume of sodium silicate.

ELISABETH LUX. 

